Prosecutor Carmen Matteo said Mr van Oosterom was killed after he tried to break up a fight that started between the youth and another person in the car park of The Bushman Hotel, Gawler.

"After closing time, a significant, physical altercation occurred in the car park between this youth and the person mentioned as a victim in count one (assault), and the deceased, who is the victim in count two (manslaughter), intervened in that altercation," she said.

"It is alleged that one of the adult co-offenders intervened between the altercation between this youth and the deceased and a fairly significant fracas ensured."

While his friends gathered for a silent march in Scheveningen, The Netherlands, South Australians began a collection to help support Henk van Oosterom's partner and child after his bashing death at Gawler. Picture: Michel Porro/Getty Images

Ms Matteo said Mr van Oosterom pushed the adult co-accused who fell to the ground while the youth and another co-accused were nearby.

"This youth then assaulted the deceased with a blow to his head," Ms Matteo said.

One of the alleged adult offenders allegedly took hold of Mr van Oosterom by his waist before the other, Jason Bridgland, 21, delivered the fatal punch.

"Bridgland entered the affray at this time, he delivered a single blow in the nature of a punch with a fist to the deceased, causing him to fall to the ground," Ms Matteo said.

"The deceased lost consciousness and did not recover."

In spite of the allegations, home detention bail was not opposed by Ms Matteo, who requested no-contact clauses with his fellow co-accuseds and an eye witness if released.

Andrew Noblet, for the youth, told the court his client would not breach his conditions.

He said his client had a close relationship with his mother and that he needed assistance with his diabetes.

However, Magistrate Lydia Makiv refused bail on the grounds that the offence was too serious, prompting the youth's mother, who was present in the body of the court, to begin sobbing.

"Notwithstanding the prosecution not opposing home detention bail, this court is not prepared to grant bail," she said.

The youth will return to court next month.

Earlier this month, Bridgland was remanded in custody after appearing in Elizabeth Magistrates Court.

A Craigmore man, 18, has been granted police bail to appear in Elizabeth Magistrates Court next month.

Meanwhile, Mr van Oosterom's fiancee, Sandra van der Klink has spoken of her pride over his actions on the night he was hurt.

Speaking publicly for the first time yesterday, Ms van der Klink, 29, said she was proud of her partner - the father of the couple's 18-month-old daughter, Janice - for trying to help others but she would forever miss his smile.

The couple had intended to marry this Sunday. Instead she is planning Mr van Oosterom's funeral.

"One hit was enough - one blow to the head and he was gone," she said from her home in the Netherlands. "It's not the community that did it to him or South Australia who did it to him."

Ms van der Klink sent a powerful message to people about the dangers of alcohol and violence.

"Please, please do not hurt other people because you are drunk or want to have fun," she said.

"We are all humans and people get in fights, but go out to have fun, don't go out to hurt other people, because you are ruining people's lives, you are ruining families. Not just ours, but the guys who took Henk's life also have families and they've broken their families too.

"You are ruining your own life, other people's lives; it's just not worth it."

Mr Oosterom was in South Australia for about eight weeks and had been working for a Dutch company constructing greenhouses, near Two Wells.

The teenager charged over Mr van Oosterom's death appeared in court yesterday. His charges were upgraded to manslaughter. His application for home detention bail will be heard in the Youth Court today.

Earlier this month, Smithfield man Jason Bridgland, 21, was remanded in custody after appearing in Elizabeth Magistrates Court on a charge of aggravated causing serious harm.

A Craigmore man, 18, was granted police bail to appear in Elizabeth Magistrates Court next month.

The Advertiser is part of a national News Limited campaign to end violence on our streets and in pubs and clubs.

After a series of violent incidents, the State Government announced plans for a new code of practice for licensed venues and committed $1 million to a public awareness campaign to fight drunken violence. It also wants to re-introduce plans for lock-outs.

And in the wake of Mr van Oosterom's death, three Gawler pubs will close earlier from this week in a bid to stamp out alcohol-related violence.

Owners of The Bushman Hotel, Exchange Hotel and Prince Albert have elected to introduce the stricter licensing measures.

The changes include closing at 2am instead of 3am, no entertainment after 1am, last drinks at 1.30am and a midnight lockout.

Ms van der Klink described her partner, 39, as a quiet but funny man, a doting father and a compassionate carer.

She said it was his unconditional compassion that led to his tragic death and she could take some comfort knowing he died doing what he believed in.

"He had a really big heart, a gentle heart, and he cared about everyone around him, including people he didn't even know," she said.

"If he heard they were struggling, he would go and help them. In the street here, if he saw two guys fighting he would go in between and say `come on, that's not necessary'."

"He had the most scars on his body for breaking up fights so when I heard he died during a fight and trying to break it up I thought, `you idiot, I warned you, I told you'.

"But on the other hand, I'm proud of him because he died for what he believed in and not many people can say that."

Ms van der Klink said the couple's wedding, planned for this Sunday, had been replaced by continual grief.

A NOTE ABOUT RELEVANT ADVERTISING: We collect information about the content (including ads) you use across this site and use it to make both advertising and content more relevant to you on our network and other sites.